It was the first attack on an American ship since the U.S. Navy shot and killed three pirates who had captured American freighter captain Richard Phillips. Their deaths had angered pirates in Somalia and prompted Vice Admiral Bill Gortney to say it "could escalate violence in this part of the world."

One of the pirates whose gang attacked the Liberty Sun told the Associated Press today that his group was specifically targeting American ships and sailors.

"We will seek out the Americans and if we capture them we will slaughter them," said a 25-year-old pirate based in the Somali port of Harardhere who gave only his first name, Ismail.

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"We will target their ships because we know their flags. Last night, an American-flagged ship escaped us by a whisker. We have showered them with rocket-propelled grenades," Ismail told the AP.

Hours after the latest attack and threats, Secretary of State Hillary Clinton outlined steps the administration will take to combat piracy.

Clinton called for international efforts to help Somalia crack down on piracy, for ships to avoid pirates, and to secure the release of about 300 hostages.

She also proposed freezing the assets of pirates, although they work from remote fishing villages, often use stolen ships, and their multi-million dollar ransoms are bags of cash that are air dropped to them.

Clinton said, however, "We have noticed that the pirates are buying more and more sophisticated equipment. They're buying faster and more capable vessels. They are clearly using their ransom money for their benefit, both personally and on behalf of their piracy. And we think we can begin to try and track and prevent that from happening."

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Since Phillips' rescue, pirate activity has surged off the Somali coast with four ships captured in rapid succession. At least two other ships, a freighter named the Safmarine Asia and the Liberty Sun, were able to escape the pirates.

A pirate mother ship, which carries attack skiffs and pirate crews deep into the ocean in search of vulnerable vessels, was spotted Tuesday by a French helicopter that had intervened to help disrupt the attack on the Safmarine Asia, the French Defense Ministry said.

The chopper and the French warship Nivose tracked the ship and captured it early this morning. Eleven pirates are now in custody, the French Defense Ministry said.

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Last week, French commandos recovered a hijacked yacht and killed several pirates and captured two. One of the pirates' hostages died in the assault.

The destroyer Bainbridge got a distress call Tuesday night from the Liberty Sun while the destroyer was carrying Phillips to Mombasa for a reunion with his crew. Instead, it was diverted to help the Liberty Sun.